Improvement in furnaces for steam-boh-ers



Witnesses'.

Inventor:

form represented in the drawings.

aient militer.'

JOHNv C. GRIIP, OF PIT'ISBURG, PENNSYLVANIA.

Letters Patent No. 113,424, daad April 4, 1871.

IMPROVEMENT lN FURNAC-ES FOR STEAM-BOILERS.

The Schedule referred to in these Letters'Patent` and Ymaking part of the same.

To allavhom 'it may concern..-

Be itknown that I, JOHN G. GRIPP, of Pittsburg, inthe county of Allegheny and State of Iennsylvania, have invented a certain new and useful Improvementin Furnace for Steam-Boilers; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings and to the letters of reference marked thereon. v Y

The nature of my invention consists in the combination of a bridge-wall, arch-wall, and air-chamber "with a furnace and air-tubes, constructed, arranged, and operating in the manner hereinafter described.

lo enable others skilled in the art to make and use my invention, I will-proceed to describe its construction .and operation.

The accompanying drawings represent a longitudinal section of an ordinary nue-boiler and its furnace.

m represents the boilers.

n represents the flue of the boiler.

x represents the firelchamher.

J .represents the ash-pit. A' represents thebridge-wall, which is made in the B represents anarched wall, which should bevmade of good fire-brick, and should extend from the boiler down ihto the air-chamber U, so that its lower edge willhe below the top edge of the bridge-wall A, as in dicated by the dotted lines .marked 5.

f represents a cold-air passage.

D represents a series of air-tubes, which is secured in the' plat-es .markcd t. These tubes should be small and extend the'full width of the furnace in atleast two rows. I 7

C represents the air-chamber. ve represents the `furnacedlue.

o represents the chimney or stack. 1

As the-construction and arrangement of the different parts of the furnace will readily be understood by reference to accompanying drawings without fur.

ther description, I will proceed to describe the operation of my'improved furnace. r

The re is placed in the fire-chamber x, and the draught of the furnace and form of the bridge-wall will cause the flame and smoke to rise, .as indicatedl by the arrow marked 1, and strike against the arched wall B, which will cause the flame and smoke to react back towardthe re, as indicated by'the arrow marked 2, and the draught of the" furnace will cause said flame and smoke to return back and down into the airchamber G, as indicated by the arrows mark-ed 3.

lhe ame and smoke, as they enter chamber C, will I wish it clearly understood that I do not claim, broadly, the use of the arch-wall B, for such wall may be seen in the patent granted I-I, F. Baker, May 30,l

Having thus described the nature, construction, and operation of my improvement,

Vfhat I claim as of my invention is- The solid bridge-wall A, having its top inclined to v the solid arch-wall B, projecting from the bottom of the boiler immediately in rear of the bridge-walhthe 'cold-air tubes D, supported by the plates@ between v the bridge-wall and bed of the furnace, so as to leave` the combustion-chamber C above them and immediately beneath the arch-wall B, all constructed and combined as described, for the purpose specied.

JOHN C. GRIP-P.

Witnesses:

J AMns J. Jornrsrrou, ALEXANDER HAYs. 

